Electrocochleography

Question 1

The major contribution to cochlear microphonic (CM) arises from…

Answer 1

Hair cells located in the basal region of the cochlea

Question 2

The procedure most used to cancel CM in ECochG recordings consists of

Answer 2

Averaging condensation and rarefaction polarities

Question 3

The compound action potential (CAP) evoked by clicks

Answer 3

Reflects the activation of the auditory nerve fibers located in the basal region of the cochlea

Question 4

The best correlation between the compound action potential (CAP) and audiometric thresholds has been found

Answer 4

At frequencies of 1, 2, and 4 khz

Question 5

The sensitivity of the SP/AP ratio in diagnosing Ménière Disease is

Answer 5

60%

Question 6

Compared to the ECochG potentials recorded from normal subject, the responses obtained from ears with endolymphatic hydrops show

Answer 6

Increased duration

Question 7

The most frequent ECochG pattern observed in patients with auditory neuropathy consists of

Answer 7

A prolonged negative potential with reduced amplitude compared to normally hearing subjects

Question 8

Differences in CAP and ABR thresholds can be observed in

Answer 8

Subjects affected by neurological disorders involving the brainstem

Question 9

Children discharged from the neonatal intensive care unit (NICU) who show absent ABRs…

Answer 9

Have hearing thresholds that cannot be reliably estimated on the basis of ABR recording

Question 10

The ECochG responses recorded from children discharged from the NICU show

Answer 10

prolonged duration in more than half of patients